Abstract

The gelatin–dichromate photosensitive system has been shown to be very efficient as a recording medium for both two- and three-dimensional holographic gratings. Upon development, as much as 33% of incident reading light is diffracted into the first order for the unmodulated thin phase gratings and 95% for the thick holograms. The material can record a grating spacing at least as small as 2600 Å, and gives reconstructions comparable with those obtained in 649F film. The air–gelatin index differential of 0.54 is considered responsible for the high diffracted powers found. Exposures vary from 3 mJ to 150 mJ at 4880 Å. Certain films have speeds within two orders of magnitude of 649F holographic film.

© 1968 Optical Society of America

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